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This heading covers pebbles, gravel and broken or crushed stone (including mixtures of different kinds of stone), of a kind commonly used for concrete aggregates, for road metalling or for railway track or other ballast. Segregated materials of construction and demolition waste consisting essentially of broken pieces of stone which are used for the same purposes, either as such or after crushing, also fall in this heading.
The heading also includes shingle and flint. Round modules of flint are used in ball mills for crushing lime, cement, etc. Flint is, however, mainly used, after crushing, in the ceramic industry or as an abrasive material. Other shingle is used in ball mills (e.g., for grinding lime, cement, etc.) or for road metalling.
It should be noted that the heading does not cover flint in cut blocks, or stones which have been manufactured by artificial rounding into pebbles for use in ball mills. These fall in heading 68.02.
The heading also covers macadam and tarred macadam.
Macadam is composed of roughly graded crushed stones, pebbles, slag, dross or similar industrial waste, or intermixtures of these materials. When mixed with tar, bitumen, etc., it is known as tarred macadam.
Products specially prepared (e.g., by fusion of a mixture of minerals) e.g., for addition to road surfacing materials, to improve hardness, anti‑skid properties, visibility, etc., are excluded from this heading (generally heading 38.24).
The heading also includes granules, chippings and powder of stones of heading 25.15 or 25.16; when artificially coloured (e.g., for shop window displays), such chippings and granules are, however, classified in heading 68.02.
The following products remain classified in this heading even when they have been heat treated :(1) Pebbles, gravel and broken or crushed stone. (2) Shingle and flint. (3) Granules, chippings and powder of stones of heading 25.15 or 25.16.
In accordance with Note 3 to this Chapter, any products classifiable in this heading and any other heading of the Chapter are to be classified in this heading.
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clhs@clhs.co.kr 
070-4214-8300